Mix water and sugar together until sugar is dissolved. Put in the fridge to chill until ready to use.

Use soap and water to thoroughly wash the limes. You want to scrub really well because you are going to be using the whole lime! After you've washed and scrubbed your limes, cut the ends off the limes (DO NOT MISS THIS STEP!) and then cut them into eighths.

Place half of the limes, half of the raspberries and half of the sugar water in your blender and pulse 5 times. Strain through a fine mesh strainer into the pitcher that you are going to serve it in. Discard the pulp and seeds from the raspberries. Repeat with the second half of your limes, raspberries and sugar water. Serve over lots of ice.